US3429807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regenerating ion exchange material from service demineralizers
Assignee: WILLIAM R BURGESS
•
Filing: 1966-12-08
•
Granted: 1969-02-25
•
Expires: 1986-12-08
Abstract
No abstract record available.
Inventors
- 👤 William R Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05; B01J49/09
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2572082A
Cited
US2692244A
Cited
US2736698A
Cited
US2744066A
Cited
US2767140A
Cited
US3193498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |